x*ln(2*4/x)-170/1500=0
    sin(80－x)/sinx = 2cos40
    sin(80－x)/sinx=2sin40
    x^2+x-1=0
    X=30136-(1145+17.8%X)
    X=47321-(1145+17.8%X)
    9*x^4+6*x^3-14*x^2+16*x-8=0
    9*x^4+6*x^3-14*x^2+16*x-8=0
    9*x^4+6*x^3-14*x^2+16*x-8=0
    9*x^4+6*x^3-14*x^2+16*x-8=0
    9*x^4+6*x^3-14*x^2+16*x-8=0
    9*x^4+6*x^3-14*x^2+16*x-8=0
    9*x^4+6*x^3-14*x^2+16*x-8=0
    9*x^4+6*x^3-14*x^2+16*x-8=0
    3/2x(x+1)²=100
    x²+2√5x²+5
    x²+2√5x+5
    x²+50x-5000
    (2*1.414*x-x^2-1)^(-0.5)*(x/1.414-1)=x/1.414*(1-x^2)^(-0.5)
    2/d+1/(d+4)+1/(d+6)=1/(d+1)

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